Daily Protein Intake Calculator

How Daily Protein Intake Is Calculated

Protein needs vary by activity level, body composition goals, age, and health status. The baseline is anchored to body weight.

Protein Intake Formula: Daily Protein (g) = Body Weight (kg) × Protein Multiplier

Multiplier by Goal/Activity:

• Sedentary adults (minimum health): 0.8 g/kg
• Lightly active / general fitness: 1.2–1.4 g/kg
• Endurance athletes: 1.4–1.7 g/kg
• Strength training / muscle building: 1.6–2.2 g/kg
• Cutting calories while preserving muscle: 2.0–2.4 g/kg
• Older adults (50+, to prevent sarcopenia): 1.2–1.6 g/kg

Worked Example: An 80 kg male lifting weights 4× per week, aiming to build muscle:

• Protein = 80 × 2.0 = 160 grams per day
• At ~4 calories per gram: 160g protein = 640 calories from protein
• Across 4 meals: ~40g per meal

High-Protein Food Reference:

• Chicken breast (100g cooked): ~31g protein
• Greek yogurt (200g): ~20g protein
• Eggs (1 large): ~6g protein
• Canned tuna (100g): ~26g protein
• Lentils (100g cooked): ~9g protein
• Whey protein shake (1 scoop): ~25g protein

Timing Note: Spreading protein across 3–5 meals (~30–40g per sitting) maximizes muscle protein synthesis more effectively than eating most protein at once. This is because leucine — the key amino acid that triggers muscle protein synthesis — has a threshold effect: you need about 2–3g of leucine per meal to trigger a meaningful anabolic response. Most 30–40g protein servings naturally provide this amount.